For the diprotic titration you will be performing in the lab your unknown solution will be a mixture of po43– and hpo42–. at the first equivalence point all of the po43- will have been converted to hpo42-, so the solution will now contain only hpo42– . in a similar calculation to that in the previous question, a student has found that their original solution contained 1.238 mmol of po43-. if reaching the second equivalence point consumed 21.85 ml more of 0.1041 m hcl, how many mmol of hpo42– were in the original sample? report answer to 3 decimal places. no units necessary.

the answer is option a.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.